The poor face constraints that are often invisible to policymakers.

畜牧业的未来在于平衡生产力和动物福利。

The ultimate goal of machine learning is to make computers learn from experience and improve their performance over time.

被盗的身体在被盗的土地上工作。这是一个不会停止的引擎，它饥饿的锅炉以血为食。